Hello,
syzbot found the following crash on:
HEAD commit: 43b815c6 Merge tag 'armsoc-fixes' of git://git.kernel.org/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12165d0b600000
kernel config: https://syzkaller.appspot.com/x/.config?x=1ec3be9936e004f6
dashboard link: https://syzkaller.appspot.com/bug?extid=76e3977ad1b8cc4d113a
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+76e3977ad1b8cc4d113a@xxxxxxxxxxxxxxxxxxxxxxxxx
------------[ cut here ]------------
WARNING: CPU: 1 PID: 25558 at fs/readdir.c:150 verify_dirent_name+0x67/0x80
fs/readdir.c:150
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 25558 Comm: syz-executor.2 Not tainted 5.4.0-rc1+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
panic+0x2dc/0x755 kernel/panic.c:220
__warn.cold+0x2f/0x3c kernel/panic.c:581
report_bug+0x289/0x300 lib/bug.c:195
fixup_bug arch/x86/kernel/traps.c:179 [inline]
fixup_bug arch/x86/kernel/traps.c:174 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:verify_dirent_name+0x67/0x80 fs/readdir.c:150
Code: 19 b6 ff 44 89 e0 5b 41 5c 5d c3 e8 43 19 b6 ff 0f 0b e8 3c 19 b6 ff
41 bc fb ff ff ff 5b 44 89 e0 41 5c 5d c3 e8 29 19 b6 ff <0f> 0b 41 bc fb
ff ff ff eb ca 0f 1f 44 00 00 66 2e 0f 1f 84 00 00
RSP: 0018:ffff88808db87ad0 EFLAGS: 00010212
RAX: 0000000000040000 RBX: 000000000000000c RCX: ffffc900143e7000
RDX: 0000000000004d26 RSI: ffffffff81bcf9b7 RDI: ffff88808db87cd3
RBP: ffff88808db87ae0 R08: ffff88808f5c41c0 R09: 0000000000000004
R10: fffffbfff120d9b8 R11: ffffffff8906cdc3 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000004 R15: ffff88808db87e50
filldir64+0x40/0x670 fs/readdir.c:356
dir_emit include/linux/fs.h:3542 [inline]
__fat_readdir+0xd9e/0x1cb0 fs/fat/dir.c:677
fat_readdir+0x44/0x60 fs/fat/dir.c:704
iterate_dir+0x47f/0x5e0 fs/readdir.c:105
ksys_getdents64+0x1ce/0x320 fs/readdir.c:412
__do_sys_getdents64 fs/readdir.c:431 [inline]
__se_sys_getdents64 fs/readdir.c:428 [inline]
__x64_sys_getdents64+0x73/0xb0 fs/readdir.c:428
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc825c13c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59
RDX: 0000000000001000 RSI: 00000000200005c0 RDI: 0000000000000007
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc825c146d4
R13: 00000000004c0533 R14: 00000000004d2c58 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
